Concentrator



No. 750,075. I v PATENTED JAN. 19, 1904.

-' W. G. ANDERSON.

GONGENTRATOR.

APPLI OATION FILED AUG. 10, 1903.

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UNITED STATES Patented January 19, 1904,

PATENT OFFICE.

WILLIAM ANDERSON, OF SAN FRANCISCO, CALIFORNIA.

CONCENTRATOR.

SPECIFICATION forming part of Letters Patent No. 750,075, dated January19, 1904.

Application-filed August 10, 1903.

To aZZ whom it may concern.-

Be it known that I, WILLIAM GRANT ANDER: son, a citizen of the UnitedStates, residing at San Francisco, in the county of San Francisco andState of California, have invented certain new and useful Improvementsin Concentrators, of which the following is a specification.

My invention relates to improvements in" concentrators, the object of myinvention being to provide an apparatus of this character which willsave a greater proportion of values than those heretofore used.

In concentrating-tables which have a longi tudinal shaking motion andwhich are adjustably inclined to one side the pulp has a tendency. toflow off diagonally. In prior constructions the dirty water near thefeed end of the concentrator carries off the slimes and fineconcentrates before they have time to settle or get the benefit of theclean water. There is thus considerable loss of values. It is the objectof my invention to avoid this.

My invention therefore resides in the novel construction, combination,and arrangement of parts for the above ends hereinafter fully specified,and particularly pointed out in the claim. g

In the accompanying drawings, Figure 1 is a plan view of theconcentrator. Fig. 2 is a longitudinal section thereof. Fig. 3is atransverse section. Fig. 4 is a detail of a roller of the lateraltrough. Fig. 5 is avertical section of the transverse trough- Fig. 6 isa crosssection of the feed-box. Fig. 7 is a broken longitudinal sectionof the same.

Referring to the drawings, 1 represents the supporting-frame for theconcentrator, and 2 represents the table itself, which is lower on Saidtable is divided into upper and lower portions by a drop 3, extendingtransversely across. the table, said drop being of sufficient depth toallow a trough 4:, extending the entire length of the drop, to returnthe pulp from the lower side of the table to the upper side thereof. Thetable is covered with linoleum 5 and has longitudinal riffles 6 both onits upper and lower portions. These riffles catch the concentrates orvalues as the pulp which is discharged from the pulp-box 7 at the upperor feed end Serial No; 168,899. (No model.)

of the table flows sidewise toward the lower side thereof; but as thetable is also inclined longitudinally downward from said feed end saidpulp moves in an oblique direction, and before it flows off the side ofthe table into the tailings-discharge box Sit is conducted, by means ofa series of spouts 9, into the trough 4, which is inclined downwardtoward the upper side of the table, and therefore reconducts the pulp tothe upper side thereof. In said trough 4. are a series of holes 10 aboutthree inches apart, closed by plugs 11, which can be removedto allow thepulp to flow out at any desired point upon the lower portion of thetable, where it is now exposed to the action of the clean water from theclean-water box 12. Thus the slimes and light concentrates have a chanceto settle.

The riffles or grooves are of uniform length, from three-quarters of aninch to two inches apart. according to the ore that has to be treated.Their height diminishes gradually to nothing at the end of the table.

The shaking motion of the table may be produced by any suitable means,as by an eccentric 13 on a shaft 14, said eccentric being connected tothe table by a link 15. The table is supported on half-round bars 16,which reciprocate upon rollers 17. The inclination of the table isadjusted by screws 18.

It will be understood that I do not confine myself to a single drop inthe concentratingtable, as I may use two or more drops, accord- Aconcentrating-table sloping to one side 7 and provided with means forimparting thereto a longitudinal reciprocating movement and consistingof upper and lower portions located longitudinally or endwise of eachother each portion sloping longitudinally downward from the feed end ofthe table, said portions having a transverse drop therebetween, eachportion having longitudinal riffles, the riflies of the upper portionextending down to said drop, a trough at said drop for conveying thepulp to the upper side of the table, said trough having holes fordistributing the pulp upon the lower portion of the table, and means forremovably and selectively closing said holes,

and a series of spouts inclined downward toward the upper side of thetable, and discharging from the upper rifiies into said trough, incombination with means for dis: charging the pulp upon the upper portionand water upon the lower portion, substantially as described.

In witness whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

W. (ir. ANDERSON. Witnesses:

F. M. W RIGHT, BESSIE GORFINKEL.

